Neodymium and lead isotope evidence for enriched early Archean crust in North America

Details Neodymium and lead isotope evidence for enriched early Archean crust in North America Neodymium and lead isotope evidence for enriched early Archean crust in North America

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.340..222b&link_type=abstract

Nature (ISSN 0028-0836), vol. 340, July 20, 1989, p. 222-225. Research supported by NASA and NSF.

Computer Science

21

Earth Crust, Geochemistry, Isotopic Enrichment, Lead Isotopes, Neodymium Isotopes, Biotite, Cratons, Feldspars, North America, Rocks

Scientific paper

Neodymium and lead isotope measurements and uranium-lead zircon geochronology from Archaean gneisses of the Slave Province in the Northwest Territories of Canada are reported. The gneisses contain zircons with cores older than 3.842 Gyr and an epsilon(Nd) (3.7 Gyr) of - 4.8. This is the oldest reported chondritic model age for a terrestrial sample and provides evidence for strongly enriched pre-3.8-Gyr crust, a reservoir complementary to the depleted mantle already in existence by 3.8 Gyr before the present.

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